STM32-高级定时器TIM1的应用

void GPIO_Configuration(void)//配置IO脚

{

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOB, &GPIO_InitStructure);

}

void TIM1_Configuration(void)

{

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_OCInitTypeDef TIM_OCInitStructure;

TIM_DeInit(TIM1); //重设为缺省值

TIM_TimeBaseStructure.TIM_Prescaler = 4000; //预分频(时钟分频)72M/4000=18K

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数

TIM_TimeBaseStructure.TIM_Period = 144; //装载值 18k/144=125hz 就是说向上加的144便满了

TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置了时钟分割 不懂得不管

TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0; //周期计数器值 不懂得不管

TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure); //初始化TIMx的时间基数单位

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //PWM模式2

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //正向通道有效 PA8

TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //反向通道也有效 PB13

TIM_OCInitStructure.TIM_Pulse = 40; //占空时间 144 中有40的时间为高，互补的输出正好相反

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性

TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; //互补端的极性

TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; //空闲状态下的非工作状态 不管

TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; //先不管

TIM_OC1Init(TIM1,&TIM_OCInitStructure); //数初始化外设TIMx通道1这里2.0库为TIM_OCInit

TIM_Cmd(TIM1,ENABLE);

TIM_CtrlPWMOutputs(TIM1,ENABLE);

}

void SetT1Pwm1(u16 pulse)//设置捕获寄存器1

{

TIM1->CCR1=pulse;

}

/*TIM1的定时器通道时间 1到4 分别为 PB8 PA9 PA10 PA11 而互补输出分别为 PB13 、PB14 、PB15、 PB12

如果输出与互补输出极性相同的话 就刚好输出高 互补低 至于PWM模式1 与模式2的区别。如下图模式一：

模式2与模式1互补，144中有40 为高 互补的有40为低。